Sharpening mechanism for grinding machines



May 5, 1931. R. E. READ 1,803,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 7 Sheets-Sheet 1 VENTOR 6Z5 4,

ATTORNEY May 5, 1931. R. E. READ I SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 '7 Sheets-Sheet 2 @a7,n WW

ATTORNEYS TOR ad,

y 5, 1931. R. E. READ 1,803,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 7 Sheets-Sheet 3 ATTORNEYJ.

May 5, 1931. E. READ 1,803,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 T Sheets-Sheet 4 l INVENTOR ATTORNEYS y 1931. R. E. READ I 1,803,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 7 Sheets-Sheet 5 3 I ENTOR W 1 l i l ATTORNEYJ.

May 5, 1931. R. E. READ 1,303,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 192' 7 Sheets-Sheet 6 ATTORNEYS May 5, 1931. R. E. READ 1,803,487

SHARPENING MECHANISM FOR GRINDING MACHINES Filed May 14, 1927 7 Sheets-Sheet 7 III INVENTOR.

@LYSMW ATTORNEYJI Patented May 5, 1931 stares PATENT OFFICE",-

' ROBERT READ, OF WHITE PLAINS, YORK, ASSIGNOR T INTERNATIONAL PAPER COMPANY, A CORPORATION OF NEW YORK SHARPENING: MECHANISM FOR GRINDING IIIACHINES Application filed May 14,

This invention relates to mechanism for sharpening or burring the surface of the grinding element or stone ofwood pulp grinding machines, and has reference more particularly to that type ofsharpening mechanism in which a sharpening tool or burr is advanced to and held in contact with the grinding face of the revolvlng stone, and

while in contact is caused to traverse the moving face and thereby burr-or sharpen the same,

()ne of the objects of the invention is to prov de a sharpening :mechamsm which, in

the traversing movement of the burr, will be the side of the stone without the necessity of standing in front of the same, whereby in the event of the bursting of the stone, the attendant will not be liable to injury by the flying parts.

A further object of the invention is to actuate the burr in its feeding movement to and from the stone, by power means, thereby enabling the attendant with the minimum of effort to expeditiously and conveniently set the burr with its proper degree of pressure on the stone for the traversing movement.

A further object of the invention is to provide mechanism inwhich the various operative parts are actuated by power under. the complete control of the attendant, thereby enabling the sharpening operation to be efiected quickly,with noefiort on the-part of the attendant except for the manipulation ofthe power controllingmeans, and with the maximum of uniformity of action and efficiency of operation. v

VVith'these and other objects in view, the

invention consists of the improved form and construction of parts which will be described in detail in the specification to follow, and

1927. SerialNo. 191,307.

the novel features of which will be set forth in the appended claims.

In the accompanying drawings:

Fig.1 is aside elevation of'a wood'grindingmachine and my improved sharpening mechanism applied thereto.

' .Fig. 2 is a plan view on an enlarged scale of'the sharpening mechanism showing in 'dotted lines the adjacent portions of the frame ofthe grinding machine, V

Fig. 3 is a front elevation of said mecha msm.

Fig. 4 is a side elevation of the same as viewedfrom the right in Fig. 2.

Fig. 5 is a cross section on the line 5-5 of Fig. 2.

Fig. (Sis a longitudinal section on the line 6- 6 of Fig. 2, on an enlarged scale.

Fig. 7 is a perspective view of the end of the burr-carrying slide and the gear train for operating sald slide. l

Fig. 8 is a longitudinal sectional elevationof the hydraulic cylinder for operating the burr-carrying slide,showing the piston there in andthe parts operated by said piston. j

Fig. 9 is an end elevation ofthe same, looking in the directionof the dotted arrow in Fig. 2.

Fig. 10 is a cross section on the line 1010 of Fig. 2;

, Fig; 11' is" a sideelevation, with parts brokenaway, of a' modified form, of the construction shown in Figs. 8,9 and 10.

Fig. 12 is transverse sectional elevation of the same on the line l212 of Fig. 11.

Referring to the drawings grinding machine provided with the usual wood-holding pockets 2 surmounted by cylinders 3 in which pistons l operate to force the wood against a rotarygrindstone 5 carried by an operatingshaft 6.

The improved sharpening mechanism, designated by the reference numeral 7, is suitably supported'by extensions 8 and 8 of the 'bed plate of the frame of the grinding machine in such position that the burringor sharpening tool 9 of the sharpening mecha nism may be caused to act on the peripheral Referring to Fig. 1, lidesignates' a wood.

grinding surface of the stone as will be more particularly described later on.

The feed of the burring tool to and from the sto e and the pressure of the same there against, is effected by means of a horizontal power cylinder 10 and a piston 11 therein, which cylinder is supported at the front of the grinding machine near one side of the same on the extension 8, and extends at right angles to the axis of rotation of the stone; and the traversing movement of the burring tool across the peripheral face of the stone is effected by a horizontal power cylinder 12 and a piston 13 therein, which cylinder ex- '11 front of and parallel with the axis Jorted by the bed g tool 9 is rotatably mounted a horizon al stud or axle supported in the of two bars 14 bolted, as by to the opposite sides of a clamping bolts 13,

feed member or slide 16 movable to and from the stone, the said boi" extending through holes in the slide and bars at intervals in the lcngthof the same, whereby the burring tool may be adjusted relatively to the slide in the direction of movement of the latter to and from the stone, in order ,JO compensate for the reduction in diameter of the stone due to the dressing or sharpening action of the tool thereon.

The slide 16 is movably supported in guides 17 in a traversing member or carriage 18 actuate-d, as will be presently described, by the piston 13 of the power cylinder 12, the movement of the slide being in a direction to and from the grindstone, so that the burring tool may be moved up to contact with and held pressed against t" e periphery of the stone for the burring action, such movement and action of the tool being effected by the piston 11 of the power cylinder 10 through the medium of suitable gearing and driving connections best shown in Figs. 2, 3, 6, 7 and 8 and now to be described.

On reference to Fig. 8 it will be seen that the piston rod 19 connected with the piston 11 extends outwardly through the forward end of the cylinder 10 and has connected with its outer end an upwardly extending cross head 20, which cross head is connected at its upper end with the forward end of a rack bar 21 extending rearwardly and guided in a bracket 22 fixed to and extending upwardly from the rear end of the cylinder. The rack teeth 21 which are on the underside of the rack bar, mesh with a spur pinion 23 fixed to an operating shaft 24 mounted at one end to rotate in a bearing 22 in the bracket 22 and at its other end in a bearing 25 on the bed extension 8 as shown in Fig. 2, as a result of which construction and arrangement of parts, the movement of the piston rearwardly in the cylinder will rotate the pinion in the direction of the arrow, Fig. 8, and will correspondingly rotate the shaft 24 to feed the burring tool toward the stone, and the movement of the piston forwardly in the cylinder will operate to reverse the movement of said parts.

Splined to the shaft 2% so as to slide longitudinally thereof and rotate therewith, is a bevel pinion 27 mounted in a bearing 28 in the forward end of the traversing carriage 18, which latter has formed at its forward end two arms 29 and 30, the arm 29 surrounding the shaft 24 and supporting the bearing 28, and the arm 30 surrounding the shaft and being slidable thereon. The bevel pinion 27 meshes with a bevel pinion 31 keyed to the forward end of a short shaft 32 having keyed to its rear end a spur pinion 33 formed with hub portions journaled in bearings in the forward end of the carriage at a point between the two arms and 30, which pinion 33 meshes with a spur pinion 3% formed with hub portions jour' aied in bearings in the traversing carriage above the pinion 33, whereby the rotary motion imparted to the shaft 2d by t 1e pinion 23, will be transmitted to the pinion Elet tluouga the medium of the bevel pinionr 27 and 31 and the spur pinion 33. The s threaded interiorly to screw on a extending feed screw 35 which is c ampe at its rear end to a lug 36 depending from "he slide 16 as shown in Fig. 6, whereby the r tation of the pinion 34 by the gear rain hereinbefore described, will feed the screw endwise and will impart a corresponding feeding movement to the slide 16 and the burring tool carried thereby.

From the construction described, it will be understood that the burring tool will be subject to the action of the feeding mechanism operated by the piston 11, during the entire traversing movement of the tool as controlled by the piston 13, due to the fact that in the travel of the traversing carriage, the gear train carried thereby is maintained in driving connection with the operating shaft 24t0 which the bevel 27 is splined. As a result, the position of the burring tool in its movement to and from the grinding stone may be controlled from a single point at the side of the machine, either by means of a valve mechaism 37 for controlling the admission of pressure luid to the actuating cylinder and thereby controlling the pow 1 means, or by means of a hand wheel 38 applied to the end of the shaft 2d for operating the feed mechanism manually.

The controlling valve mechanism 37 is connected in pipes 39 and 40 leading respectively to the opposite ends of the cylinder 10, and to an inlet pipe 41 and an outlet or exhaust pipe 42, the said valve mechanism being of the usual four-way type and operable in its dif ferent positions by a valve handle 37 to open one end of the cylinder to the entrance of the pressure fluid, in the present instance water, and the other end of the cylinder to the outlet 'or exhaust, whereby the pistonmay be caused to move back and forth ,in-the cylinder and advance or retract the burring'tool as desired, a pressure indicator 43 being applied to the forward end of the cylinder in order to indicate the degree of pressure acting on the piston to advance the same, and consequently the degree of pressureunder which the burring tool will be held against the stone.

In the operation of the mechanism so far the pressure to the forward end of the cylindescribed, the attendant in feeding the burring tool up to and pressing the same against the stone will adjust the controlling valve by means of the handle 37 to a position to admit der in front of the piston and to open the opp osite end of the cylinder to the exhaust. The piston being advanced by the pressure fluid, the slide 16 carrying the burring tool-will be 20 fed forwardly toward thesto-ne and the burring tool will be engaged therewith. The further advance of the tool being thus arrested the pressure behind the piston will build up, and when the tool bears with the proper degree of pressure on the stone for its proper dressing action in the traversing movement of the tool, which pressure may be determined by observing the reading of the pressure indicator, the shaft 24 is locked firmly against rotation, in order to hold the tool in its set position. In the present instance this locking of the shaft is effected by means of a clamping screw 44, see'Figs. 2 and 9, engaged with the bearing of the shaft 24 on the bracket 22, which bearing is split as at 45 so that it may be contracted by the screw and clamped firmly to the shaft and thereby hold the same against rotation. In the traversing movement of the burring tool under 40 these conditions, it will be caused to travel in a straight uniform path and will beelfectually prevented from deviation from said path, so that there will be no liability of the tool abrading soft spots in the surface of the stone. As a result the grinding surface of the stone will be dressed squarely and uniformly throughout its extent.

The traversing carriage 18 is mounted to slide on guideways 47 surmounting the cylin- 50 der l2, and is connected to the piston 13 of said cylinder so as to be moved back and forth thereby, by means of an operating rod 48 eX- tending above and parallel with the cylinder and connected at one end to the side of the carriage as at 49. At its opposite end the on crating rod is connected to the upper end of a cross head 50, whose lower end is connected to the outer end of a piston rod 51 extending through the end of the cylinder and having its inner end connectedtothe piston 13 therein.

The admission of pressure fluid to the cylinder and its exhaust therefrom is controlled by a four-way valve mechanism 52 connected 6 to pipes 58 and 54 leading to the opposite between its ends, the piston ends respectively of the cylinder, and to an inlet pipe 55 and an outletpipe 56,the valve of said mechanism being operated by a valve handle 52 so that the valvemay be set to admit pressure to either side of the piston and open the other side to the exhaust and thereby cause the piston and consequently the traversing carriage to move in one direction or: the other as desired.

Itis to be noted that the controlling valve mechanism 52 is at the same sideof the mechanism as the controlling valve mechanism for the cylinder 10, so that a single attendant standing at the sideof the machine may control both the feeding and traversing actions of the burring tool.

7 This I deem of importance in that the attendant is not compelled in controlling the feed of the burr to and from the cylinder and its. pressure thereon, to stand in front of the stone and he is therefore notliable-to be injured in the 'eventof the stone bursting, as some times occurs.

In Figs. 11 and 12 are illustrated a modifield. form of the connections for' .operating the shaft 24 by the power piston "of cylinder 10. In this case the rack bar 19 is situated within the cylinder and is formed on the piston rod, ancl'meshes with a pinion .23 located within the cylinder at a point about-midway being provided with two heads connected by the rack bar.

difference being that it is the forward movement of the piston within the cylinder which The operation however is substantially the same as that of the partsshown in Fig. 8, the

feeds the tool up tothe stone, instead of the rearwardmovement of the piston as in the vconstruction shown in Fig. 8.,

While in the foregoing'description and'accompanying drawings'the invention has been set forth in the particular detailed form and construction of parts which have been found suitablefor the ends in view. Itrwill be understoodthat these details may bevariously changed by the skilled mechaniclwithout departing from the limits of'the invention; and further will be understood that the invention isnot limited to any particular form or constructionofthe parts except insofar as eratively connected with the side for moving it on the carriage ,.a rotary shaftextending in the direction of movement of the traversing carriage and" having operative engagement with said mechanism in the different positions of the carriage, a power cylinder and a piston therein operativcly engaged with the shaft for rotating it, and means for controlling the operation of the piston.

2. In combination with a grinding machine provided With a rotary grindstone, a traversing carriage movable in the direction of the axis of the stone, means for moving said carriage, a slide mounted on the carriage and movable relatively thereto to and from the peripheral face of the stone, a sharpening tool carried by the slide, a rotary operating shaft extending in the direction of movement of the trr ersing carriage, means for rotating said shaft, an operating wheel rotatably mounted on the carriage and splined to the operating shaft, and operative connections between s, id gear wheel and. the slide for moving the same on the carriage.

3. In combination with a g'inding machine provided with a rotary grindstone, a traversing carriage movable in the direction of the axis of the stone, means for moving said carriage, a. slide mounted on the carriage and movable relatively thereto to 8.211, from the peripheral face of the stone, :1 sharpening tool carried by the slide, a retary operating shaft extending in the direction of movement of the traversing carriage means for rotating said shaft, a power cylin der and a piston therein operatively cngap'er with the shaft for rotating it, a gear whee rotatably mounted on the carriage d splined to said shaft, operative connections between said gear wheel and the slide for moving the same on the carriage, and means for controlling the operation of the piston.

l. In combination with a grinding 1nachine provided with a rotary grindstone, a traversing carriage movable in the direction of the axis of the stone, means for moving said carriage, a slide mounted on the carriage and movable relatively thereto to and from the peripheral face of the stone, a sharpening too]. carried by the slide, a feed screw connected with the slide for moving it on the car riage, a pinion journaled in bearings on the carriage and threaded interiorly to receive the feed screw, a rotary operating shaft 6};- tending in the direction of movement of the traversing carriage, a gear wheel rotatably mounted on the carriage and splined to said shaft, said gear wheel being operatively connected with the pinion for rotating it, and means for rotating the operating shaft,

5. In combination with a grinding machine provided with a rotary grindstone, a traversing member movable in the direction of the axis of the stone, a slide mounted on the traversing member and movable relatively thereto to and from the peripheral face of the stone, a sharpening tool carried by the slide, gear mechanism operative on the slide in the different positions of the traversing member to move said slide toward the stone and set the tool in operative engagement therewith, means including a pressure cylinder mounted in fined position adjacent one side of the grindstone for operating said mechanism, and means for locking the mechanism in its set position.

6. In combination with chine :n'ovided with a rotar traversing member movable tl e direction of the axis of the stone, power mechanism for opera-tin g the traversing member, a sharpening tool movable on the traversing member to and rein the peripheral face of the stone, power mechanism for moving said tool on the traversing member, said power mechanism including a fluid pressure cylinder fixed one side of the machine relative to the gri iding ma- 1 y grindstone, a 1n -traversing member, and a piston in said cylind r opcratively connected with the sharpening tool for moving it on the traversing member, and means for controlling both of said power mechanisms from a position at one and the same side of the machine.

7. combination with a grinding maprovided with a rotary grindstone, a member movable in the direction as of said stone, power means for g aid traversing member, a sharpening tool mounted on the traversing member and movable relatively thereto to and from the stone, mechanisn'i on the traversing member operativeiy engaged with. the sharpening, tool for feeding the same to and from the grindstone, a rotary operating member for the feeding mechanism extending in the oirection and for the full length of movement of the traversing member and vith which said feeding mechanism has splined driving engagement throughout the movements of the traversing member, and power means for rotating said operating member.

In testimony whereof, I have affixed my signature hereto.

ROBERT E. READ. 

